C00D11CD is "Unknown Error".  Generally it doesn't have a single solution or
answer.  To help us figure the real problem you it would be great if you
could provide some more basic information about the problem.  That being
said please read on for some basic troubleshooting help for the error.

If none of the information below helps you will need to provide us with *as
much* information about the problem as you possibly can. - See
http://tinyurl.com/2o4h9

For a few common solutions to error C00D11CD, please see
http://tinyurl.com/2wpw7

Q: Are you playing an AVI?
If so...You likely don't have the right codec installed for that specific
AVI or you have a bad install of the codec.

Using a DirectShow decoding filter such as FFDShow will decrease the
problems you could run into with codec problems.  FFDshow will decode XviD,
DivX 3/4/5, 3IVX, and has support for many other codec's.  It can be
downloaded at http://tinyurl.com/2snnx. (Download ffdshow-20020617.exe and
then run it's installer)

If you have the correct codec installed and the video still doesnt play
download GSpot and run your AVI though the program.  If Gspot says "Failed
to render", "Missing Chuck", etc. then your video file is corrupt.

If you just wish to install the individual codec's for your specific video
or FFDShow doesnt support the codec for you file please do the following.
- Download and use GSpot (http://tinyurl.com/328cp)
- Run the installer, open GSpot, goto File>>Open.
- Look for the 4CC code for the file's Video Codec
- http://tinyurl.com/262go will help you.
(Or post the information back here and I can help)
-If you don't get audio, what codec does it use?  GSpot also tells you this.

Q: Are you playing any type of content directly from a web link?  (Streaming
audio, video, radio, etc)
If so...You must provide the exact link to what you are trying to access.
The homepage isn't important, but an exact link to the content is.

Q: Are you playing an MPEG/MPG file?
If so...Please provide the following information in a reply to this post.
-Does it only happen with a few MPEG/MPG files?
-If so...It's most likely a file encoded with the MPEG-2 codec.  To decode
this you will need to install an MPEG-2 decoder.  Follow the link to more
information.
http://www.nwlink.com/~zachd/pss/pss.html#mpeg2
-If not...Can you provide a link or more information about the file?

Q: Are you trying to burn a CD?
If so...Please see http://tinyurl.com/32zkh.  That being said the IMAPI
burner that is included with WMP isn't very good.  If the above link doesn't
help goto http://tinyurl.com/u8p3 and, download the free Nero Fast Burn
Plug-in.  This plug-in will *not* burn DRM-enabled WMA's (Those downloaded
from pay sites like Napster, MusicNow, etc.)  If you are looking for better
software for burning CD's try Roxio's Easy CD/DVD Creator or Nero Burning
ROM.

Easy Media Creator
http://tinyurl.com/414r

Nero Burning ROM
http://tinyurl.com/3xt8a

Q: I having problems playing and/or burning DRM-enabled WMA's. (Ex.
Wal-Mart, Napster, MusicNow)
If so...Your best bet is to ask either the support provided by the site you
bought them from or contact Microsoft Support.  No one who regularly posts
in this newsgroup knows a great deal about troubleshooting DRM-enabled
files.

Microsoft Product Support
http://tinyurl.com/29y9t

Q: Are you having problems playing MIDI's?
If So...Please see http://tinyurl.com/23vqj.  That should cover most MIDI
issues.

Q: Are you trying to play a MOV, RM, RA file?
If so...Please goto http://tinyurl.com/2sp39 and notice that those are not
supported file type in WMP.  You need to use RealPlayer or RealOne for RM,
RA, Etc.  And then use QuickTime for MOV.